Light ballast



FIG. 1 is an upper right front perspective view of a light ballast;

FIG. 2 is a lower left rear perspective view of a light ballast; and,

FIG. 3 is a front elevational view of a light ballast; the rear elevation being a mirror image thereof;

FIG. 4 is a right side elevational view of a light ballast;

FIG. 5 is a left side elevational view of a light ballast;

FIG. 6 is a top plan view of a light ballast.

FIG. 7 is a bottom plan view of a light ballast; and,

FIG. 8 is a cross sectional view of a light ballast, taken along section line 8-8 of FIG. 6.

The broken lines in the drawings illustrate portions of the light ballast which form no part of the claimed design. 

CLAIM The ornamental design for a light ballast, as shown and described. 